VALUE OF SWAMP LANDS. 7 



could not be permanently improved until the surface water 

 was removed Where water stands thirty inches below the 

 surface such a crop as corn cannot be successfully grown. 

 Since it was impossible for the owners of such lands to 

 drain them thoroughly by ordinary means, experiments were 

 made to see what temporary improvement could be made 



AVERAGE SAMPLES OF CORN GROWN ON SWAMP LAND, WITH AND 



WITHOUT KAINIT. 

 Experiment made by Experiment Station of Indiana. 



in the crops. Part of the land selected for the experiments 

 was plowed in the ordinary way. Another part was sub- 

 soiled in addition, that is, after plowing, a sub-soil plow 

 was run deeper in each furrow, not turning the lower soil 



